[(log x)^(x)+x log^(x)],[" 15.If "y=log[...

[(log x)^(x)+x log^(x)],[" 15.If "y=log[x+sqrt(x^(2)+a^(2))]," show that "(x^(2)+a^(2))(d^(2)y)/(dx^(2))+x(dy)/(dx)=0" .Threet "],[" 16.Show that the fiunction "f(x)=x" .Fet "x" ."]

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